<?php
/**
 * CRegularExpressionValidator class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CRegularExpressionValidator validates that the attribute value matches to the specified {@link pattern regular expression}.
 * You may invert the validation logic with help of the {@link not} property (available since 1.1.5).
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id: CRegularExpressionValidator.php 3120 2011-03-25 01:50:48Z qiang.xue $
 * @package system.validators
 * @since 1.0
 */
class CRegularExpressionValidator extends CValidator
{
    /**
     * @var string the regular expression to be matched with
     */
    public $pattern;
    /**
     * @var boolean whether the attribute value can be null or empty. Defaults to true,
     * meaning that if the attribute is empty, it is considered valid.
     */
    public $allowEmpty=true;
    /**
     * @var boolean whether to invert the validation logic. Defaults to false. If set to true,
     * the regular expression defined via {@link pattern} should NOT match the attribute value.
     * @since 1.1.5
     **/
    public $not=false;

    /**
     * Validates the attribute of the object.
     * If there is any error, the error message is added to the object.
     * @param CModel $object the object being validated
     * @param string $attribute the attribute being validated
     */
    protected function validateAttribute($object,$attribute)
    {
        $value=$object->$attribute;
        if($this->allowEmpty && $this->isEmpty($value))
        return;
        if($this->pattern===null)
        throw new CException(Yii::t('yii','The "pattern" property must be specified with a valid regular expression.'));
        if((!$this->not && !preg_match($this->pattern,$value)) || ($this->not && preg_match($this->pattern,$value)))
        {
            $message=$this->message!==null?$this->message:Yii::t('yii','{attribute} is invalid.');
            $this->addError($object,$attribute,$message);
        }
    }

    /**
     * Returns the JavaScript needed for performing client-side validation.
     * @param CModel $object the data object being validated
     * @param string $attribute the name of the attribute to be validated.
     * @return string the client-side validation script.
     * @see CActiveForm::enableClientValidation
     * @since 1.1.7
     */
    public function clientValidateAttribute($object,$attribute)
    {
        if($this->pattern===null)
        throw new CException(Yii::t('yii','The "pattern" property must be specified with a valid regular expression.'));

        $message=$this->message!==null ? $this->message : Yii::t('yii','{attribute} is invalid.');
        $message=strtr($message, array(
			'{attribute}'=>$object->getAttributeLabel($attribute),
        ));

        $pattern=$this->pattern;
        $pattern=preg_replace('/\\\\x\{?([0-9a-fA-F]+)\}?/', '\u$1', $pattern);
        $delim=substr($pattern, 0, 1);
        $endpos=strrpos($pattern, $delim, 1);
        $flag=substr($pattern, $endpos + 1);
        if ($delim!=='/')
        $pattern='/' . str_replace('/', '\\/', substr($pattern, 1, $endpos - 1)) . '/';
        else
        $pattern = substr($pattern, 0, $endpos + 1);
        if (!empty($flag))
        $pattern .= preg_replace('/[^igm]/', '', $flag);

        return "
if(".($this->allowEmpty ? "$.trim(value)!='' && " : '').($this->not ? '' : '!')."value.match($pattern)) {
	messages.push(".CJSON::encode($message).");
}
";
    }
}